I am about to upgrade hard drives and I was attempting to back up data to an SD card that I had used before flawlessly. The disks app said that it was read only, and when I put in a cat picture to test that, it didn't go in. I am a relatively new Linux user, so I do not know how to change the permissions. Can you help? I am using Ubuntu 14.10.
This may sound stupid, but is the card locked? There should be a little gray switch on the side of the card. This caused me many headaches myself.
This is what a lock looks like, and where to find it:
Sorry for the poor image, this was my camera SD card, and therefore the only one I had. (I had to use my webcam).
As you can see, the lock is in the unlocked position.
Wow... That was it. I feel so stupid. Sorry for wasting your time. Dec 30, 2014 at 23:50
No problem. I was running Homebrew on my wii and was about to smash the thing against the wall when I found this, don't feel stupid. Not many people know about it, and nobody checks to see because it's so small. Once, my switch broke off. Dec 31, 2014 at 19:44
dmesgand look for any error messages relating to the filesystem being remounted read-only and add them to your question.